I gave my Hamsters watermelon is it safe for them to eat?

I was reading what fruits a Hamster can eat and I found a thread that said watermelon is ok for them but in small pieces so I gave my Syrian hamsters some and they ate it straight away. I then found another thread that said it's not good for them so now I'm confused. Is it good or not? They've never... show more I was reading what fruits a Hamster can eat and I found a thread that said watermelon is ok for them but in small pieces so I gave my Syrian hamsters some and they ate it straight away.

I then found another thread that said it's not good for them so now I'm confused.

Is it good or not? They've never had it before so I gave them a tiny piece about the size of your pinky finger nail.
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